• Home
• Julia

empty!

empty!(collection) -> collection

Remove all elements from a collection.

Examples

In the Julia programming language, the function empty!(collection) is used to remove all elements from a given collection in-place.

julia> arr = [1, 2, 3, 4, 5];
julia> empty!(arr)
0-element Array{Int64,1}:

Here are some common examples of using empty!:

1. Empty an array:

   julia> arr = [10, 20, 30, 40];
   julia> empty!(arr)
   0-element Array{Int64,1}:

2. Empty a vector of strings:

   julia> words = ["apple", "banana", "orange", "grape"];
   julia> empty!(words)
   0-element Array{String,1}:

3. Empty a dictionary:

   julia> dict = Dict("name" => "John", "age" => 25, "city" => "New York");
   julia> empty!(dict)
   Dict{String,Any} with 0 entries

Common mistake example:

julia> empty!([1, 2, 3])
ERROR: MethodError: no method matching empty!(::Array{Int64,1})

In this example, empty! is called on a regular array, which is not a mutable collection. empty! is only applicable to mutable collections like Vector, Dict, etc.

See Also

User Contributed Notes

Add a Note

The format of note supported is markdown, use triple backtick to start and end a code block.